Yet again on string append vs concat vs +

Question

May be I am splitting hair, but I was wondering in the following case:

String newString = a + b + c;  //case 1


String newString = a.concat(b).concat(c);          


        

Answer 1

On performance Analysis with JDK 1.8, I found case 2 as the winner in terms of performance.

class Solution {
public static void main(String[] args) {
   String s ="ABC", s1 = "", s2 = "", s3 = "";
   long t1 = System.nanoTime();
   for(int i = 1; i < 11; i++) {
       s1 = s1 + s;
   }
   System.out.println(System.nanoTime() - t1);
   System.out.println(s1);

   long t2 = System.nanoTime();
   for(int i = 1; i < 11; i++) {
       s2 = s2.concat(s);
   }
   System.out.println(System.nanoTime() - t2);
   System.out.println(s2);

   long t3 = System.nanoTime();
   StringBuilder sb = new StringBuilder();
   for(int i = 1; i < 11; i++) {
       sb.append(s);
   }
   s3 = sb.toString();
   System.out.println(System.nanoTime() - t3);
   System.out.println(s3);
 }
}

Results :

40615

ABCABCABCABCABCABCABCABCABCABC

9157

ABCABCABCABCABCABCABCABCABCABC

20243

ABCABCABCABCABCABCABCABCABCABC